Testing device.



E?. H. NCMERSON L G. G. COURVTNEY.

` TESTING DEVCE.

fmmmmimz mm Juurlzz. 19m.

' @mam Dm, l2, 'NM

.RYAL HIGHER/SON ND GEORGE G.

COURTNEY, 0F PLYMOUTH, MASSACHUSETES.

TESTING DEVICE.

Specification of Letters Patent.

ratentea nee. ia, iota..

l.application led July 22, 1913. Serial No. 780,500.

To all whom it may concern:

Be it known that we, .ROYAL H. Nickersonand GEORGE Gr. COURTNEY,citizens of the United States, residing at Plymouth, in the county ofPlymouth and State of Massachusetts, have invented new and usefullmprovenients in 'llesting Devices, of which the following is aspecification. y t

This invention relates to improvements in testing devices and hasparticular application to a device for testing electric circuits.

ln carrying out the present invention, it is our purpose to provide adevice of the class described whereby the electrical continuity of acircuit may be readily and conveniently ascertained.

Furthermore, we aim to provide a testing device for electric circuitswhich may be carried about by the lineman in his pocket .and which willbe comparatively light in weight so that the same may be easily packedaway and transported.

llt is also our purpose to provide a testing device of the type setforth which will embrace the desired features of simplicity, eiiiciencyand durability, one which maybe easily and quickly connected up to thecircuit to be tested, and one which may be manufactured and marketed ata minimum expense.

With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts hereinafter set forthin and falling within the scope of the claim.

in the accompanying drawing, Figure 1 is a view in elevation of atesting device constructed in accordance with our present invention.Fig. 2 is a longitudinal sectional view through the casing of the sourceof energy.

in the practice ploy a source of energy having one side connected to oneterminal of an electric circuit, a sounder having one side connected tothe remaining side of the source of energy, and a serrated terminalmember connected to the other side of the sounder and designed to berubbed over the free terminal of the circuit so that the diaphragm ofthe sounder or re- 4ceiver will be vibrated, in the event of the ecircuit being unbroken, whereby the lineman will be advised as to thecondition of the circuit.

Referring now to the accompanying drawing in detail, the numeral 1'designates a of our invention, we em- I suitable casing or housingconstructed of any suitable material and designed to receive a suitablesource of electrical energy such. for

instance, as a small dry cell 2. One end of f the housing 1 is closedand formed with an outwardly projecting handle 3, while the opposite endthereof is open and adapted to be closed through the medium of aremovable closure or cap 4t. Passed through the center ofthe cap 4 andinsulated therefrom as at 5 is a headed pin 6 having the head thereofdisposed upon the under side of the cap and the' other end terminating ashort distance beyond the cap and preferably carrying a clip 7. rlheheaded end of the pn 6 is in contact with one terminal of the dry cell 2while the opposite terminal of such cell is connected with a bindingpost8passed through the side wall of the casing 1 and insulatedtherefrom as at 9.

The numeral 10 designates an electric current carrying cord composed oftwo conductors 11, 12, one terminal of the conductor 11 being tappedonto the binding post 8 while the adjacent terminal of the conductor l2is equipped with a terminal member 13 in the form of a pin serratedafter the fashion of a file or rasp.

The numeral 14 designates a-sounder or receiver of any suitableconstruction connected to the free terminals of the conductors 11 and 12of the cord 10.

From the foregoing description taken in connection with the accompanyingdrawing, the constriction and manner of employing our invention will bereadily apparent. lln practice, the clamp or clasp 7 is secured to oneterminal of the circuit to be tested, while the serrated terminal member13 is adapted to be rubbed over the free terminal of such circuit. `Whenthe terminal member 13 is in engagement with the respective end of thecircuit wise, it will be seen-that the source of energy and receiver areconnected in series in the circuit so that as the terminal member isrubbed across the adjacent end of the circuitl wire, the diaphragm ofthe receiver or sounder 14 will be vibrated and so notify the linemanthat the circuit is intact. 0n the other hand, if the circuit isinterrupted or broken for some reason, the sounder or receiver willrefuse to act thereby advising the lineman as to the condition of thecircuit.

While we have herein shown and described one preferred form of ourinvention by way Eid of illustration, We wish it to be understood thatwe do not limit or confine ourselves to the precise details ofconstruction herein described and delineated, as modification andvariation may be made within the scope of the claim Without departingfrom the spirit of the invention.

We claim:

In a device of the class described, in combination a casing2 a batterymounted snugly in said casing, said casing having a concavo convexbottom, said battery having a con- Vex bottom snugly fitting the concaveside of said casing, said battery projecting in spaced relation from theouter edge of said casing, a can three-d upon the outer edge cap adaptedto force the last named contact of said casing, a contact fingerextending transversely in said casing between said cap and battery andsecured to the latter, said cap being provided with an opening, thecontact member having a conductor rod extending through the opening insaid cap, said to bear against the iirst named contact linger.

In testimony whereof we aiix our signatures 1n presence of twowitnesses.

ROYAL H. NICKERSON. GEORGE G. COURTNEY.

Witnesses:

FREDERICK D. BARTLET, PHILWS, BARNES.

